Quoted from CactusJack:

frb,
Can you advance your unit 5 more steps and show us another picture of the two black cams? I am wondering if there is a version with 1 hill and a version with 1 valley? The zero position would OPEN at the home or what we will call 0 position. The bonus advance would be open and then possibly close at position 9 (just like the carry over switch on a score reel).
In theory, a match unit with the two PCBs could use the second PCB just for the 9th position switch. But the PCB probably can't handle the current that the leaf switch could. But you would still need a single home position cam for the zeroing function to work.
The Zero function isn't completely necessary to make the game work. It would just leave the green circle light at the last place when the ball drains. Games like Bally Champ did this anyway where the next player could steel your "almost there" advances. I think Bow and Arrow was like this too. Shows a bit of extra thinking on the Engineers part at Gottlieb.

Quoted from CactusJack:

I am thinking the crafty op is the guy that stole the AS relay in the first place to fix a more valuable game way back when. Many a good Tech has completely given up on re-adjusting a troublesome AS relay and opted for pulling one from somewhere else (game in warehouse etc.). Unfortunately, the bad parts rarely finds its way back to the machine it was "barrowed" from (take for example all the container games that show up with complete assemblies missing from them, never to be found other than on other doner games.
Then, along came someone that bought the King Rock out of a warehouse and found the darn thing completely missing. And did what they could to repopulate it with another AS relay (possibly a match unit) from yet another game. Like I said, if there are actually only 2 wires soldered to the second wiper PCB, it was done to serve as the carry over (bonus) switch.
Did we check to see if the game's Match unit is still in the head?